Gold prices rose 139% in 3 years: Can the yellow metal rise more, what should investors do?

Given the impressive returns in the last few years, investors are wondering if gold prices have hit their peak. Is it a risky time to invest in gold, or is there still some steam left in the yellow metal? What investment horizon suits you best and what form of gold should you invest in? Also should you invest a lump sum amount or spread it out over time? Let’s see what experts say.